Talk to everybody as an interpreter

We are conducting a class with spanish and english speaking people. Some use spanish, some use english and some use original language since they understand both. The interpreter is also a student, end everytime she needs to participate we all have to agree and choose the same channel in order to hear her participation.

Is there a way for the interpreter to make an announce or talk to everyone. Other than ending the interpretation, do the talking, and then reactivate interpretation?